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PIT: add alternative faster PIT

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This is enabled by default on 486+ CPUs and can be forced disabled/enabled with pit_mode=0/1
This commit is contained in:
Adrien Moulin
2022-07-23 13:38:10 +02:00
parent 23e082aeea
commit 2aa5d8f5b2
26 changed files with 968 additions and 108 deletions
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src/machine/m_amstrad.c
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@@ -2059,7 +2059,7 @@ kbd_write(uint16_t port, uint8_t val, void *priv)
speaker_enable = val & 0x02;
if (speaker_enable)
was_speaker_enable = 1;
pit_ctr_set_gate(&pit->counters[2], val & 0x01);
pit_devs[0].set_gate(pit_devs[0].data, 2, val & 0x01);
if (val & 0x80) {
/* Keyboard enabled, so enable PA reading. */